<?php

header('Content-Type: text/html; charset=utf-8');
$i='{"info":"\u9000\u51fa\u5931\u8d25","status":0,"url":""}';
var_dump(json_decode($i));
$openid = "1";
!strlen($openid) || $itemnum  =  2222;
var_dump($itemnum);
error_reporting(E_ALL); 
var_dump(isset($an_undefined_variable)); // displays "false" since "$an_undefined_variable" is not defined 
var_dump(is_null($an_undefined_variable)); // displays "true" (as expected), but throws a notice because "$an_undefined_variable" is not defined. 